which of the following is/ are correct for lyophilic sols ?

Options

A. Its surface tension is lower than that of water
B. Its viscosity is higher than that of water
C. Its surface tension is higher than that of water
D. Its viscority is equal to that of water

Answer

To determine which statements are correct for lyophilic sols, let's analyze each statement step by step.

### Step 1: Understand what lyophilic sols are
Lyophilic sols are colloidal solutions that have a strong affinity for the dispersion medium (usually water). They are often referred to as "solvent-loving" sols. Common examples include substances like gum, gelatin, and rubber.

### Step 2: Analyze the statements
1. **Statement 1: Its surface tension is lower than water.**
- **Explanation:** Lyophilic sols interact strongly with water, leading to a decrease in surface tension. Therefore, this statement is **correct**.

2. **Statement 2: Its viscosity is higher than water.**
- **Explanation:** Lyophilic sols, being made from substances like gum and gelatin, are typically more viscous than water. Thus, this statement is also **correct**.

3. **Statement 3: Its surface tension is higher than water.**
- **Explanation:** As established earlier, lyophilic sols have a lower surface tension than water due to their strong interaction with the solvent. Hence, this statement is **incorrect**.

4. **Statement 4: Its viscosity is equal to water.**
- **Explanation:** Since lyophilic sols are generally more viscous than water, this statement is also **incorrect**.

### Conclusion
The correct statements regarding lyophilic sols are:
- Statement 1: Its surface tension is lower than water (Correct).
- Statement 2: Its viscosity is higher than water (Correct).
- Statements 3 and 4 are incorrect.

### Final Answer
The correct options are **1 and 2**.

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